I need help identifying the mistake i made

Question

THE QUESTION:
Write a program that prompts the user to read in two input
values: a number of feet, followed on a separate line by a number of inches. The program should convert this amount to centimeters. Assume
that all input values are ints. 1 foot is 12 inches and 1 inch is 2.54
centimeter. Here is a sample run of the program.
Sample run:
This program converts feet and inches to centimeters.
Enter number of feet: 4
Enter number of inches: 8
4 ft 8 in = 142.24 cm

MY ATTEMPT: (i'm getting it wrong for some reason)

print("This program converts feet and inches to centimeters")
a=(float(input("Enter number of feet:")))
b=(float(input("Enter number of inches:")))
c=a*12
d=b*2.54
r=c+d
print(c "ft" + d "in" + "=" + format(r) + "cm")

Answer 1

check for to format number and string
In yout code you have to do this:
print("{0} ft {1} in = {2} cm").format(a,b,r)

Answer 2

May you need just
r = (a*12+b)*2.54

Edit :

print("This program converts feet and inches to centimeters")
a=(float(input("Enter number of feet:")))
b=(float(input("Enter number of inches:")))
d=(a*12+b)*2.54
#r=c+d
print(f"{a} ft {b} in = {d} cm")

Answer 3

Hello